Grinding wheel

ABSTRACT

Grinding wheel for a floor grinding machine, comprising a metal wheel ( 1 ) with a first and a second flat surface. Diamond-containing grinding elements ( 11, 12 ) are arranged on the first flat surface. Grinding elements ( 11, 12 ), preferably diamond-containing, are also arranged on the second flat surface of the wheel ( 1 ).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Netherlands Application No. NL1028002, filed Jan. 11, 2005, the contents of which is incorporatedherein by reference.

FIELD OF THE INVENTION

The invention relates to a grinding wheel for a floor grinding machine.

BACKGROUND OF THE INVENTION

A grinding wheel is known from U.S. Pat. No. 3,745,719. The knowngrinding wheel includes a metal wheel with one surface on which aplurality of rectangular diamond-containing grinding elements arearranged. The known grinding wheel therefore has a single grinding side.

It is an object of the invention to provide a grinding wheel which makesmore efficient use of materials.

SUMMARY OF THE INVENTION

This object is achieved by a grinding wheel for a floor grindingmachine, comprising a metal wheel with a first and a second flatsurface, diamond-containing grinding elements being arranged on thefirst flat surface, wherein grinding elements are also arranged on thesecond flat surface of the wheel.

The grinding wheel according to the invention has two grinding sides andlasts as long as two grinding wheels which can only be used on one sideand the respective grinding sides of which correspond to the grindingsides of the grinding wheel according to the invention. Since thematerials and manufacturing costs of the metal wheel represent aconsiderable proportion of the total cost price of a grinding wheel andaccording to the invention just one metal wheel is required to achievethe same service life as two of the known single-sided grinding wheels,the grinding wheel according to the invention is therefore in relativeterms less expensive.

It is preferable for the grinding elements on the first and second flatsurfaces of the wheel to have different grinding actions. As a result, asingle wheel can be used to treat different floor surfaces. By way ofexample, a soft floor surface can be ground using grinding elements witha very hard diamond-steel compound on one side of the wheel, while aharder floor surface can be ground using grinding elements with a lesshard diamond-steel compound on the other side of the wheel. This makesthe grinding wheel according to the invention versatile to use.

It is preferable for all the grinding elements to be of the same shape.This further limits the production costs of the grinding wheel.

The invention will be explained in more detail with reference to thedrawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a metal wheel for a grinding wheelaccording to the invention,

FIG. 2 shows a front view of the metal wheel from FIG. 1,

FIG. 3 shows a cross section through the wheel on line A-A in FIG. 2,

FIG. 4 shows a perspective view of a preferred embodiment of a grindingwheel according to the invention, and

FIG. 5 shows a front view of the grinding wheel from FIG. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1-3 show a circular metal, preferably steel, wheel 1 with a firstside la and a second side 1 b. According to a preferred embodiment, thewheel 1 is approximately 8 mm thick and its diameter is approximately250 mm. The wheel 1 has a central opening 2, in this example with a wavyedge 3, in the middle. The central opening 2 in the wheel 1 ispreferably formed by means of laser cutting. The circumference of theopening 2 is in this case described by a laser beam so that the centralpart of the wheel 1 is cut out. The central opening 2 is used to couplethe wheel 1 to a coupling part (not shown) of a drive shaft of agrinding machine. The coupling part (not shown) comprises toothing whichis of a complementary shape to the circumferential shape of the centralhole 2.

Four first securing holes 4 and four second securing holes 5 with adiameter of preferably about 11 mm are arranged on an imaginary circlearound the central opening 2. The first securing holes 4 and secondsecuring holes 5 are located alternately around the circle. The securingholes 4 and 5 each have a conical section 4 a and 5 a, respectively, thediameter of the conical section 4 a and 5 a being approximately 22 mm atthe wheel surface 1 a or 1 b, respectively.

During use, bolts or other securing means pass through the firstsecuring holes 4 if the first side 1 a of the wheel 1 faces towards thesurface to be ground. In this case, the head of the bolt or the like, inthis first fitted state, is recessed into the conical part 4 a, belowthe surface 1 a. The second securing holes 5 are not used in this firstfitted state.

When the wheel 1 is turned over in order for the opposite side to befitted to the grinding machine, bolts or the like are also passedthrough the securing holes 5, with the head of the bolts once againbeing recessed within the conical section 5 a. In this second fittedstate, the securing holes 4 are not used.

FIG. 4 shows a preferred embodiment of a grinding wheel 10 according tothe invention. The grinding wheel 10 comprises a metal wheel 1 asdescribed above with reference to FIGS. 1-3. Elongate, curved grindingelements 11 which extend substantially in the tangential direction arearranged at the edge of the metal wheel 1, on both sides 1 a and 1 b ofthe wheel. The radius of curvature of the radially outermost surface ofthe grinding elements 11 corresponds to the radius of curvature of theouter circumference of the wheel 1.

Furthermore, curved elongate grinding elements 12 which extendsubstantially in the radial direction of the wheel 1 are arranged onboth sides 1 a and 1 b of the wheel 1. One of the end edges of thegrinding elements 12 is located at or close to the outer circumferenceof the circular wheel 1. The radially arranged grinding elements 12 onthe first side 1 a and on the second side 1 b have their concave sidesfacing in opposite directions, as will be clear from FIG. 5.

In the example shown, the tangentially and radially arranged grindingelements 11 and 12 are identical in form, which limits the manufacturingcosts of the grinding elements and therefore the cost price of thegrinding wheel 10. The grinding surface of the grinding elements 11 and12 lies approximately 10 mm above the surface of the wheel 1 on whichthey are arranged, i.e. the first side 1 a or the second side 1 b.

The grinding elements 11 and 12 are preferably made from adiamond-containing diamond-steel compound. It is possible for thegrinding elements 11 and 12 which are arranged on one side 1 a of thewheel 1 to be made from a different compound from the grinding elements11, 12 which are arranged on the second side 1 b of the wheel 1. Thismakes it possible to produce a grinding wheel 10 with different grindingactions on each side. It is also possible for diamond-containinggrinding elements 11, 12 to be arranged on one side 1 a, while grindingelements 11, 12 made from a compound which does not contain diamonds arearranged on the other side 1 b.

It is preferable for the grinding elements 11 and 12 to be welded to thewheel 1, but other suitable joining methods are of course also possible.

It should be noted that in the embodiment shown a central opening 2 witha wavy shape is formed in the grinding wheel 10, but any other suitableshape of hole, for example circular or square, is also fundamentallypossible.

1. Grinding wheel for a floor grinding machine, comprising a metal wheelwith a first and a second flat surface, diamond-containing grindingelements being arranged on the first flat surface, wherein grindingelements are also arranged on the second flat surface of the wheel. 2.Grinding wheel according to claim 1, wherein the grinding elements onthe first and second flat surfaces of the wheel have different grindingactions.
 3. Grinding wheel according to claim 1, wherein the grindingelements arranged on the second flat surface are diamond-containing. 4.Grinding wheel according to claim 1, wherein the wheel is substantiallycircular.
 5. Grinding wheel according to claim 1, wherein at least someof the grinding elements are arranged at or close to the circumferentialedge of the wheel.
 6. Grinding wheel according to claim 1, wherein thegrinding elements are welded to the wheel.
 7. Grinding wheel accordingto claim 1, wherein the grinding elements are elongate in form. 8.Grinding wheel according to claim 7, wherein at least some of thegrinding elements extend substantially in the tangential direction. 9.Grinding wheel according to claim 7, wherein at least some of thegrinding elements extend substantially in the radial direction. 10.Grinding wheel according to claim 7, wherein at least some of thegrinding elements extend substantially in the tangential direction andat least some of the grinding elements extend substantially in theradial direction, wherein the grinding elements which extend in thetangential direction and the grinding elements which extend in theradial direction are arranged alternately in the vicinity of thecircumferential edge of the grinding wheel.
 11. Grinding wheel accordingto claim 8, wherein the tangentially extending grinding elements arecurved.
 12. Grinding wheel according to claim 9, wherein the radiallyextending grinding elements are curved.
 13. Grinding wheel according toclaim 1, wherein all the grinding elements are of the same shape. 14.Grinding wheel according to claim 1, wherein the diamond-containinggrinding elements comprise a diamond-steel compound.
 15. Grinding wheelaccording to claim 1, wherein the wheel is provided with a centralopening for coupling to a drive shaft of the grinding machine. 16.Grinding wheel according to claim 15, wherein the central opening isdelimited by an edge which is wavy in form.
 17. Grinding wheel accordingto claim 15, wherein the central opening is formed by laser cutting. 18.Grinding wheel according to claim 1, wherein securing holes for securingmeans to fit through are arranged in the wheel, the holes being formedin such a manner that the head of the securing means, in the fittedstate, is recessed below the level of the surface of the wheel.